The site of this work is the campus of Yantai University. The base is located on the main axis of the campus. It is the most active public open space in the school and has become the most dynamic place. From this, the plan tries to create a movable building department hall to meet the characteristics of the campus landmark, that is, the department hall during the day and the campus market in the evening, so as to meet the various needs of students. The concept of this scheme combines the urban light rail with the assembly unit, and based on the open and clear boundary character of the urban light rail, a new thinking angle is launched on the publicity of the campus building. The silent volume in the daytime will spread out at night and go to the new position through the track to form a new volume. The day as the building of the building hall, in the night as the campus market.